Lamp socket



R. B. BENJAMIN Nov. 13 1923.

LAMP SOCKET Filed Dec. 12, 1919 Patented Nov. I3, i923.

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anatre arena' carica REUBEN B. BENJAMIN, 0F CHICAGO, ILLINOIS, ASSIGNORTO BENJAMIN ELECTRIC MANUFACTURING COMPANY, 0F CHICAGO, ILLINOIS, ACORPORATION OF ILLINOIS.

LAMP SOCKET.

Application med December 12, 1919. Serial No. 344,302.

To all whom it may concern Be it known that I, REUBEN B. BENJAMIN, acitizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented new and useful Improvements in LampSockets, of which the following is a full, clear, concise, and exactdescription, reference being had to the accompanying drawing, forming apart of this specification.

This invention relates to lamp sockets, and more specifically to lamsockets for use in locomotive headllghts an similar places.

It is desirable that the lamp socket in a locomotive headlight should bemade adjustable so that the lamp can be brought to the desired positionwith respect to the reflector in order to give the best lightdistribution. These sockets are subject toconsiderable jar and vibrationand have to be very firmly suported. It is also desirable that theadjustment should be simple and reliable.

One of the objects of my invention 4is to provide simple, durablereliable means for adjustably supporting the socket.

Further objects will appear from the detailed description to follow andfrom the ap ended clalms.

n the drawings- Fig. 1 is a vertical sectional view of a lamp socket andsupport on the line 1-1 of Fig. 4'

Fig.,2 is a bottom plan View of Fig. 1; Fig. 3 is a partial sectionalview on the line 3--3 of Fig. 4.-;

Fig. 4 is a artia-l sectional view on the line 4.--4 of Fig. 3; Y

Fig. 5 is a partial sectional view on the line 5--5 of Fig. 4; l

Fig. 6 is a plan view of Fig. 5; and Fi 7 is a perspective view of thetubular shan.

This invention is shown 1n connection with a lamp socket 10 having atubular shank 11 adjustably supported in a suitable bracket 12.Supported by the tubular shank 11 is an insulating base 1-3 'which maybe of bakelite or other suitable insulating material which Will standthe vibration and heat. The base 30 is recessed from its lower face inwhich is supported a threaded shell contact 14 for engagement with thecontact base of a suitable lighting bulb. The tubular shank 11 is formedto provide a passa e for the feed wires or. conductors 15, w ich wirespass through said passage and are received by the recesses 16 in theinsulating base 13.

Supported in the insulating base are the eyelets 17 and 17a throughwhich the bared ends 18 of the conductors pass. The eyelet 17a is inengagement with and supports the center contact 19 while the eyelet 17engages a flange portion of the shell contact to help support said shellcontact. Thebared ends of the conductors 18 are preferably soldered' tothe eyelets and supply the current to the shell and center contacts. Anopening 24 is provided in the shell contact to receive a portion of theZ-shaped lamp grip member 25, the object of this member being to providemeans to engage the lamp base to prevent unscrewing of said lamp causedby vi-A bration thereof in the receptacle portion.

The shank 11 has a long tubular portion which is adjustably supportedfor longitudinal movement in the bracket 12 whereby the light may befocused as desired. 'Ihis shank has a flange portion 26 at its lower endupon which are positioned a plurality of lugs 27 preferablydiametrically arranged near the periphery of the bottom face of saidflange.

The insulating base has in its upper face a plurality of slots 28 whichare positioned to receive the lugs 27 which fit snugly into said slotsand prevent rotation or vibration of the insulating base With respect tothe tubular shank and bracket 12.

In order that the tubular shank 11 and the insulating base 13 willsnugly engage each other to prevent relative movement and vibration ofeach with respect to the other, the insulating base is provided with anannular groove 29 into which a corresponding groove portion 30 of cap 31is beaded. The

.cap then extends u wardly and has an inwardly extending ange whichengages the iange 26 of the tubular shank whereby the lugs 27 are heldin engagement with the slots 28 in the insulating base and preventvibration and relative movement of the tubular shank and insulating basewith respect to each other.

Having thus described my invention, 'what I claim as new and desire tosecure by Letters Patent is:

1. A lamp socket construction comprising an insulating base, shell andcenter contacts supported thereby, Wiring terminals for said contactssupported by said insulating/base,

a tubular shank for insertion in a supporting bracket secured to saidinsulating base through which the conductors pass to said wiringterminals, said shank having an outwardly extending flange at itsunction with the insulating base, interengagmg means on said tubularshank and insulating base for preventing relative rotation therebetween,

and a sheet metal ring secured to said insulating base and flanged oversaid outwardly extending flange for securing said parts together. V

2. A lump socket construction comprising an insulating base, shell andcenter contacts supported thereby, wiring terminals for said contactssupported by said insulating base,

a tubular shank secured tosaid insulating base through which theconductor is passed to said wiring terminals, said shank having anintegral outwardly extendingv flange at its junctionwiththe insulatingbase, interengaging means on said tubular sha-nk and insulating base forpreventing relative rotation therebetween, and a sheet metal ringsecured to said insulating base and flanged over said outwardlyextending flange for securing said parts together, said interengagingmeans vcomprising a boss on said flange, said insulating base beingprovided with a recess for receiving said boss.

In witness whereof; II have hereunto subscribed my name.

REUBEN B. BENJAMIN.

